It means adding all additional information that will make the post the absolute must-read on the topic.

Perhaps there are new aspects of the topic you haven’t known of originally. New research that could offer a better insight. Or even up to date examples that could help highlight key aspects of the problem.

All these could enrich your original content and make it more linkworthy.

HINT:There is another benefit of expanding your content to cover additional information. By doing so you’ll naturally increase its keyword potential. Even the variety of words you’d add would improve its SEO potential.